Screw machine



Jan. 31, 1928.

F. O. ANDREWS 5 Sheets-Sheet 1 Via Jan. 31, 1928. 1,657,813

F. o. ANDREWS S CREW MACHINE Filed Jan.29, 1921 5 Sheets-Sheet 2 M M U) Jan. 31, 1928. 1,657,813

F. o. ANDREWS SCREW MACHINE Filed Jan.29. 1921 5 Sheets-Sheet 5 Jan. 31, 1928.

F. o. ANDREWS SCREW MACHINE Filed Jan.29, 1921 5 Sheets-Sheet 4 r I IIIIIIIIIIIII 21 Jan. 31, 1928. 1,657,813

F. o. ANDREWS SCREW MACHINE Filed Jan.29, 1921 5 Sheets-Sheet 5 v being operated on.

Patented Jan. 31, 1928.

PATENT OFFICE.

FRANKLIN O ANDREWS, OI WILLOUGHBY, OHIO.

SCREW MACHINE.

Application. fled January 28, 1821. Serial No. 440,877.

The invention relates particularly machines for receiving bolt or other slmilar blanks and cutting screw threads thereon although in some aspects it is not hmlted to a a machine for such s ecific use.

One embodiment 0 the invention includes a pair of oppositely disposed, aligned, rotatmg and reciprocating thread cutting die heads. Means for automatically causlng the In various movements of the die heads as well as for opening and closing them may be provided. Associated with the die heads is a mechanism for bringing blanks into alignment with them and stopping or holding the blanks in such a position that they may be properly operated on by the dies. The blank carrier may consist of a disc rotatably mounted so that one point in its circum ference is always in alignment with the die and arrangements may be made to give to the disc :1 step by step movement such that it will present blanks seriatlm to the die heads. Means may be provided for lockmg the disc against rotation when blanks are Means, independent of the disc, or co-operating therewith, if desired, or found necessary, may also be provided for grasping and holding the blanks when they are engaged by the die heads.

Seats for the blanks may be provided in the feeding disc which in and of themselves may hold the blanks against rotation when attacked by the die heads.

For the purpose'of fully disclosing the nature and advantages of the inventlon a specific embodiment thereof will be described as illustrated in the accompanying drawings. It should'be understood, however, that the invention is capable of various modifications and, therefore, it is not limited to the particular structures illustrated.

In the accompanying drawings, Figure 1 is a plan view of the machine; Fig. 2 is a side elevation of the machine from the hottom of Fig. 1; Fig. 3 is an end elevation from the right of Fig. 1; Fig. 4 is a vertical transverse section on the line 4-4 of Fig. 1;

Fig. 5 is a vertical transverse section on the line 5-5 of Fig. 1; Fig. 6 is a detail view of a part of the mechanism for moving the blank carrier: Fig. 7 is a fragmentary side elevation of the blank carrier; Figs. 8 and 9 are perspective views in details of the blank carrier; Fig. 10 is a transverse section on the line 10-1O of Fig. 7; Fig. 11 is a transverse section on the line 1111 of Fig.

7 Fig. 12 is a side elevation of a finished bolt; Fig. 13 is an end elevation of a finished bolt; Fig. 14 is a fragmentary side elevation of an optional form of blank carrier for conveying bolts in pairs; Fig. 15 is a transverse section through the carrier on the line 15- 15 in Fig. 14 and Fig. 16 is a plan view of a fragment of the carrier shown in Fig. 14.

The machine is supported on legs 1 which carry a drive shaft 2 which may be driven in any suitable manner. In the present instance a pulley 3 is illustrated over which may pass a driving belt. The drive shaft 2 carries belt pulleys 4 and 5, the belts of which extend upwards through suitable holes in a bed plate 6. Supported on the bed plate 6 are end frames 7 and 8. Connected to the end frame 7 by bracing bars 9 is an intermediate upright frame 10. Connected to the end frame 8 by bracing bars 11 is an intermediate upright frame 12.

Rotatably mounted lon itudinally on the machine in the upper en s of the frames 7 and 10 is a die shaft 13 carrying a pulle 14 through which the shaft maybe rotated by a belt 15 from the pulley 4:. "Rotatably mounted longitudinally on the machine in the upper ends of the plates 8 and 12 is a die shaft 16 carrying a pulley 17 through which the shaft may be rotated by a belt 18 from the pulley 5. The shafts 13 and 16 are mounted so as to slide longitudinally in their bearings carrying with them the various mechanisms mounted on the shafts. The shafts 13 and 16 are on opposite ends of the machine and are in alignment with each other. At the innermost end of the shaft 13 is mounted a thread cutting die head 19. On the innermost end of the shaft 16 is mounted a thread cutting die head 20. In the present instance, for the purposes of illustration, these die heads are shown as of the well known Landis type. Any other type of thread cutting head might be substituted or pointer heads may be applied to the shafts 13 and 16.

Parallel with the shafts 13 and 16 is a cam shaft 21 extending throughout the entire length of the machine. The cam shaft 21 may be rotated from. the die shaft 16 through a train of gears 22.

A face cam 23 mounted on the cam shaft 21 engages one arm 24 on a transverse shaft 25 pivoted on the bracing bars 11. Another arm 26 on the shaft 25 engages a collar on the die shaft 16,.so that as the camr23 ro- 25 center of the machine.

tendin cam shaft 21 carries a cam the upper end of an arm 4 47 extendin 48 extends from the end rom the arm 46 to the 48 jecting arm 49 of a. locking lever on the end frame 8. The lower ar 80 index plate 53 on a shaft ed in the frames 7 a throughout the length Associated with the cam 45 is a cam 55 recesses 71 and on both sides thereof are readjustable with relation to the cam 45 cesses 85in the plates 73 to receive the shanks y be locked by of bolts laced in the roulette. Other forms he cam 45. The of bolt lanks may requireother suitable cam 55 engages one arm 58 of a lever mountforms of roulette wheels. This mechanism pin 47 which has a downwardly may be sufficient but preferably other and ring 60 additional means will be employed to center om the and hold the blanks as pointed out in' the tends to hold the arm 58 next paragraph.

against the cam 55. A pin 62 on the arm Intermediate the cam shaft 21 and the 58 is engaged by a slot in the end of a link die shafts 13 and 16 and parallel with them,

63 extending to an arm 64 rotatably mounta longitudinal shaft ed on the shaft 54 adjacent the index plate mounted in bearings in the intermediate 55 through a slot 56 which ma a cap screw 57 tapped into t ed on the projecting fastened to a bed plate 6.

arm 59 engaged by a s jection 61 rising tates it will tend to force the die hcad'20 53. The arm 64 carries a pivoted pawl 65 carried by the die shaft 16 away from the tending to engage a slot in the index late center of the machine. A downwardly ex- 53. A spring 66 tends to keep the pin 62 tending tail piece 27 on the shaft 25 is enseated in the bottom of the slot in the link gaged by a spring 28 fastened to a pro ec- 63 but allows sufficient freedom of move- 70 tion 29 on the bed 6. This tends to hold ment to avoid damage or breakage 1n emerthe arm 24 against the cam 23 and consegencies. The cams 45 and 55 are so adjusted quently tends to force the die head tothat as the cam shaft rotates the cam 45 ward the center of the machine when will cause the locking lever 50 to be lifted l0 allowed by the cam. A lever 30 engaging to free the index plate 53. lVhile the lock 76 the usual collar for opening and closing the is held so disengaged (see Fig. 6) the cam cutters in the head 20 is pivoted on the frame 55 will cause the arm 64 to move the index 12 and rides between a spring 31 and the plate forward one step when it will he again stop nuts 32 on a pin 33 projecting from the locked by the member 50. The arm 64 may 15 frame 12 so as to open and close the die head now return with its pawl 65 ready for an- 80 20 d limit th amount of threads cut as other stroke for the next advance of the inthe die head 20 reciprocates.

A face cam 34 mounted on the cam shaft Rotating between the die heads 19 and 20 21 engages one arm 35 of a transverse shaft is a roulette wheel 67 mounted on the shaft 20 36 pivoted on the bracing bars 9. Another 54. The roulette wheel 67 acts as a blank 35 arm 37 on the shaft 36 engages a collar on carrier and has in its periphery as many the die shaft 13, so that as the cam 34 roblank holding sockets as there are slots in tates it will tend to force the die head 19 the periphery of the index plate 53 and the carried by the die shaft 13 away from the arrangement is such that each stepped move- A downwardly exment of the index plate will bring a new tail piece 38 on the shaft 36 is enblank between the die heads 19 and 20 and gaged y a spring 39 fastened to a projechold it in alignment therewith. The roulette tion 40 on the bed 6. This tends to hold the Wheel 67 may be built up by providing a arm 35 against the cam 34 a 30 tends to force the die hea center of the machine as allowed by the cam. A lever 41 engaging the usual collar for serts 70 may be correspondin ly dove-tailed opening and closing the cutters in the head to engage the recesses 69 anil 19 is pivoted on the frame 10 and rides bevided with recesses 71 to receive the heads tween :1 spring 42 and the stop nuts 43 on or other projections of bolts or bolt blanks.

a pin 44 projecting from the frame 10 so as The particular roulette illustrated is deto open and close the die head 19 and limit signed for rim bolts such as illustrated in the amount of threads cut as the die head Figs. 12 and 13 having shanks extending in 19 reciprocates. 40 Extending beyond the end frame 8 the heads at their middles. As clearly slown in 105 45 which engages Fig. 9 the insert 70 is provided with a re- 6 ivoted on apin cess 71 shaped substantially to correspond ame 8. A link with a hexagonal head so that when the hexupper proagonal head of a bolt is placed in the re- 5O pivoted cess 71 it may be held from turnin and m51 of the the shanks will extend per endiculary on locking lever has a spring 52 fastened to both sides of the carrier. etween the rethe end frame 8. This tends to hold the cesses 69 are radially extending lugs 72 to locking lever 50 in one of the recesses of an which may be fastened retaining plates 73 54 rotatably mountresting in the peripheral recesses 68 and exnd 8 and extending tending across the inserts so as to hold of the machine.

dex plate.

nd consequently disc with peripheral recesses 68 on both sides d 19 toward the and then cutting d0ve-tailcd recesses 69 through the remaining central portion. In-

may be pro-- both directions from hexagonal u sets or them securely in place. Registering with the 74 may be rotatably frames and 12. Carried by is a lever 7 5, one end 76 of wh1ch is engaged b y a cam 77 mounted on the cam shaft 21.

e other end 78 of the lever 75 is. bil fumted and its two fingers extend one on each side of the roulette 67 so as to engage and properly align the blank carried thereby between the die heads 19 and 20. The spread of the bifurcated end 78 may be more than the width of the roulette so that the blank is held on the shanks beyond the shank seats 85. A spring 79 on an arm 80 on the shaft 74 is fastened to the frame '12 and tends to hold the end 75 away from the roulette wheel and the end 76 against the cam 77. By this arrangement the end 78 is moved positively by the cam to enga e and hold the blank and retracted by the spring 79.

Further travel of the blank in the roulette 67 beyond the die heads 19 and 20 causes it to engage a stripper 81 rising from the bed plate 6 and extending on both sides of the roulette wheel 67. The blanks ejected from the roulette wheel by the stripper fall into a chute 82 by which they may be led by gravity from the machine.

The various cams on the shaft 21 are not shown in detail as it is believed that one versed in the art will be able to design suitable cams for any machine incorporating the present invention.

It will be understood that blanks may be placed, by hand or other suitable means, in the roulette wheel which will carry them between the die cutting heads 19 and 20 and into alignment therewith. The blanks will then be grasped and positioned by the lever 75 and the die heads 19 and 20 will be caused to approach each other and substantially simultaneously engage the 0ppo-' site ends of the blanks. After the dies have asped the blanks, the lever 75 may reease the blanks and withdraw from the path of the die heads and the die heads will proceed to cut threads on the blank until they are opened by engagement of the levers and 41 with the stop nuts 32 and 43 when the cutting heads 19 and 20 will be opened. The heads 19 and 20 will then be withdrawn from the bolts, the roulette wheel will then turn to cause the bolts to engage the stripper and be ejected and at the same time to bring other blanks into position to be operated on by the cutting head.

In the present instance as illustrated in Fig. 11 a right hand thread will be cut on one end of the bolt and a left had thread,

' on the other end of the bolt since both the die heads 19 and 20 rotate in the same direction. It will be obvious, however, to one versed in the art that a twisting of either the belt 15 or the belt 16 will cause the cutter heads 19 and 20 to run in opposite directions and so 65 both cut either right hand threads or left hand the shaft 74 threads. Such an arrangement ma have the lever 75' enga e be de-' sirable especiallwhen a roulette w eel such as is shown in igs. 14, 15 and 16 is used. The roulette wheel 67' there, shown is adapted to carry groups of two aligned bolt blanks instead of double ended bolt blanks. A continuous central circumferential plate 83 is provided and alinged sockets on each side of the plate are arranged to receive the heads of bolt blanks. The two bolt blanks thus placed with their heads against the central plate 83 will have their shanks extending in opposite directions so as to be operated on by the opposing heads 19 and 20. In this arrangement it may be desirable to provide in the roulette 67' a lengthened seat 84 adjacent. the head for the bolt shank and the holding down lever 7 5 may have its fingers broadened to correspond to the lengthened seat 84. In this arrangement I prefer to the bolt shank above the seat' 84 rather t an entirely without the roulette.

In practice suitable lubricating and other appurtenances may be applied to the device but these are well known in the art and, therefore, it is not essential that any particular type be used so none is shown.

I claim as my'inventi0n:-

1. In a machine for threadin both ends of bolts having heads at their middle, a disc having sockets in its periphery shaped to receive the heads of the bolts and hold them from turning and recesses at both sides of the sockets to receive the inner ends of the bolt shanks, oppositely disposed aligned thread cutting die heads, means to cause the disc to rotate to bring a blank into alignment with the die heads, and means to cause the die heads to simultaneously approach the blank and to cut threads on 0th ends thereof at the same time.

2. In a machine for threading both'ends of .bolts having heads at their middle, a disc having sockets in its periphery to receive the heads of the bolts and recesses at both sides of the sockets to receive the inner ends of the bolt shanks, oppositely disposed aligned thread cutting die heads, means to cause the disc to rotate to bring a blank into alignment with the die heads, means co-operating with the disc to hold a blank when in alignment with the die heads, and means to cause the die heads to simultaneously approach the blank and to cut threads on both ends thereof at the same time.

3, In a machine for threading both ends of bolts having heads at their middle, a disc having sockets in its periphery to receive the heads of the bolts and recesses at both sides of the sockets to receive the inner ends of the bolt shanks, oppositely disposed aligned thread cutting die heads, means to cause the disc to rotate to bring a blank into alignment with the die heads, means to lock the disc in such position, means co-operating wfth the disc to hold ablank when m alignment with the die heads, means to cause the die heads to simultaneouslg approach the blank and to cut threads on 0th ends thereof at the same time, and a cam shaft for actuating the disc rotating and locking means, the blank holding means, and the ie head operating means.

4. In a machine for threading bolts having heads, a disc having sockets in its eriphery sha ed to receive the heads of the olts and hol them from turning and recesses at both sides of the sockets to receive the inner ends of the bolt shanks, oppositely disposed aligned thread cutting die heads, means to cause the disc to rotate to bring blanks into alignment with the die heads, and means to cause both die heads to simultaneously approach the blanks and to cut threads on the lanks at the same time.

5. In a machine for threading bolts having heads, a disc having sockets in its periphely to receive the heads of the bolts and recesses at both sides of the sockets to receive the inner ends of the bolt shanks, oppositely disposed aligned thread cutting die heads, means to cause the disc to rotate to brin blanks into alignment with the die hea s, means co-o crating with the disc to hold the blanks w en in alignment with the die heads, and means to cause both die heads to simultaneously approach the blanks and to cut threads on the blanks at the same time. 6. A disc having annular recesses at its periphery on both sides and dovetailed recesses through the center of the disc at its periphery, inserts engaging the dovetailed recesses and having recesses sha ed to engage and hold the head of a bolt lank and binding pieces in the annular recesses holding the inserts in place and having recesses to receive shanks of bolt blanks.

7. A disc having annular recesses at its periphery on both sides and dovetailed recesses through the center of the disc at its periphery, inserts engaging the dovetailed recesses and having recesses shaped to engage and hold the head of a bolt blank, binding pieces in the annular recesses holding the inserts in place and having recesses to receive shanks of bolt blanks, means for rotating the disc, and means for working on the blanks while in the disc.

8. In a machine for threadin both ends of bolts. a carrier to receive the olts, oppositely disposed aligned die heads, means to cause the carrier to bring a blank into alignment with the die heads, means to asp a blank on both sides of the carrier, an means to cause the die heads to simultaneously approach the blank and operate on both ends thereof at the same time.

FRANKLIN O. ANDREWS. 

